- 5 Chemistry a substance capable of reacting with an acid to form a salt and water, or (more broadly) of accepting or neutralizing hydrogen ions. Compare with alkali.
Middle English: from Old French, from Latin basis 'base, pedestal', from Greek
The word or part of a word to which prefixes and suffixes are attached to form new words. In the words that follow, the base is printed in bold type.counteract underachievement unnecessarily unhappiness